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Non-Cash Transactions - Summary of Changes in Liabilities Arising From Financing Activities Including Non-cash Transactions (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2019
TWD ($)
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Abstract]  
Beginning Balance $ 10,340
Cash Flows from Financing Activities (3,728)
Changes in Non-Cash Transactions, New Leases 3,803
Changes in Non-Cash Transactions, Others (572)
Cash Flows from Operation Activities - Interest Paid (85)
Ending Balance $ 9,758